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        Ranking API transform numerical node/edge attributes in visual signs like
        size or colors.
        <p>
            A <b>ranking</b> function provides values for a particular element (e.g node or edge).
            For instance if the node has an 'age' attribute, the ranking function
            provides the age value rescaled between 0 and 1. Then, <b>transformers</b> take
            the value between zero and one and apply a visual sign to the element.
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        <p>
            Check the <code>org.gephi.ranking.spi</code> package to learn how to
            create new transformers.
        </p>
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